6533b82ffe1ef96bd1295060
RESEARCH PRODUCT
Bis(2-ethylhexyl)phosphoric acid/bis(2-ethylhexyl)amine mixtures as solvent media for lithium-ions: A dynamical study
Pietro CalandraCesare Oliviero RossiCataldo SimariIsabella NicoteraVincenzo Turco Liverisubject
ConductometrySurfactantsInorganic chemistrychemistry.chemical_element02 engineering and technology010402 general chemistrySelf-diffusion coefficients01 natural sciencesSpin-lattice relaxation timechemistry.chemical_compoundColloid and Surface ChemistryPulmonary surfactantLithium ionSpin-lattice relaxation timeSelf-diffusion coefficientsSurfactantsLithium ionMoleculeIonic conductivityPhysics::Chemical PhysicsPhosphoric acidSettore CHIM/02 - Chimica FisicaChemistryNuclear magnetic resonance spectroscopy021001 nanoscience & nanotechnology0104 chemical sciencesSolventLithium0210 nano-technologydescription
Abstract The self-diffusion coefficient, the spin-lattice relaxation times and ionic conductivity of lithium ions in liquid mixtures composed of bis(2-ethylhexyl)amine (BEEA) and bis(2-ethylhexyl)phosphoric acid (HDEHP) have been thoroughly investigated as a function of composition and temperature by NMR spectroscopy and conductometry. While the temperature and composition dependence of diffusion coefficients of lithium ions follow the same trend observed for those of the surfactant molecules, the spin-lattice relaxation times of lithium ions and 1 H are remarkably different. The observed behavior has been interpreted in terms of lithium ions diffusion occurring through its association with the negatively charged HDEHP species, whereas its rotational dynamics being decoupled from that of surfactant molecules, gives T 1 values lower than those of surfactant molecules and characterized by a different temperature dependence.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-01 |